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Applied and Environmental Microbiology, July 2006, p. 4704-4712, Vol. 72, No. 7
0099-2240/06/$08.00+0     doi:10.1128/AEM.02935-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Recurrent Seasonal Variations in Abundance and Composition of Filamentous SOL Cluster Bacteria (Saprospiraceae, Bacteroidetes) in Oligomesotrophic Lake Mondsee (Austria){dagger}

Michael Schauer,1 Jing Jiang,1,2,{ddagger} and Martin W. Hahn1*

Institute for Limnology, Austrian Academy of Sciences, Mondseestrasse 9, 5310 Mondsee, Austria,1 Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, People's Republic of China2

Received 13 December 2005/ Accepted 20 April 2006

The spatial and temporal variation of SOL cluster bacteria was assessed in oligomesotrophic Lake Mondsee and adjacent lakes by fluorescence in situ hybridization over two annual cycles. The filamentous SOL bacteria were present in Lake Mondsee throughout the study period, and the seasonal dynamics of the SOL community were remarkably similar with respect to both abundance and composition in the two consecutive years. Only two of the three SOL subclusters were detected in Lake Mondsee and four connected lakes. These two populations significantly differed in size distribution and demonstrated pronounced but recurrent differences in seasonality and length of period of appearance in Lake Mondsee. Extensive sampling of the lakes in September 2003 revealed low horizontal variation in the composition of the SOL community within Lake Mondsee but marked variations with depth. Between connected habitats pronounced differences in the composition and abundance of the SOL community were detected. The interaction of SOL bacteria with bacterivorous protists, mesozooplankton, and phytoplankton was investigated in order to reveal variables controlling the structure and dynamics of SOL communities. No strong indication for a bottom-up influence of phytoplankton was found, while the estimated community grazing rates of mesozooplankton on SOL bacteria indicated a top-down control of SOL abundance during mesozooplankton peaks in spring and early autumn. Furthermore, species-specific differences in grazing of mesozooplankton on SOL bacteria were observed. In general, the overall composition of SOL communities was controlled by abiotic factors (water chemistry), while their dynamics seemed to be controlled by abiotic and biotic interactions.

* Corresponding author. Mailing address: Institute for Limnology, Austrian Academy of Sciences, Mondseestrasse 9, 5310 Mondsee, Austria. Phone: 43 6232 3125 29. Fax: 43 6232 3578. E-mail: martin.hahn{at}oeaw.ac.at.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

{ddagger} Present address: Shenzhen Sheng Yi Environmental Co., Ltd., 8 Guishan Road, Shekou, Shenzhen 518067, People's Republic of China.

Applied and Environmental Microbiology, July 2006, p. 4704-4712, Vol. 72, No. 7
0099-2240/06/$08.00+0     doi:10.1128/AEM.02935-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Hahn, M. W., Schauer, M. (2007). 'Candidatus Aquirestis calciphila' and 'Candidatus Haliscomenobacter calcifugiens', filamentous, planktonic bacteria inhabiting natural lakes. Int. J. Syst. Evol. Microbiol. 57: 936-940 [Abstract] [Full Text]  


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